Journal ArticleDOI
An overview of limited feedback in wireless communication systems
David J. Love,Robert W. Heath,Vincent K. N. Lau,David Gesbert,Bhaskar D. Rao,Matthew Andrews +5 more
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TLDR
This tutorial provides a broad look at the field of limited feedback wireless communications, and reviews work in systems using various combinations of single antenna, multiple antenna, narrowband, broadband, single-user, and multiuser technology.Abstract:
It is now well known that employing channel adaptive signaling in wireless communication systems can yield large improvements in almost any performance metric. Unfortunately, many kinds of channel adaptive techniques have been deemed impractical in the past because of the problem of obtaining channel knowledge at the transmitter. The transmitter in many systems (such as those using frequency division duplexing) can not leverage techniques such as training to obtain channel state information. Over the last few years, research has repeatedly shown that allowing the receiver to send a small number of information bits about the channel conditions to the transmitter can allow near optimal channel adaptation. These practical systems, which are commonly referred to as limited or finite-rate feedback systems, supply benefits nearly identical to unrealizable perfect transmitter channel knowledge systems when they are judiciously designed. In this tutorial, we provide a broad look at the field of limited feedback wireless communications. We review work in systems using various combinations of single antenna, multiple antenna, narrowband, broadband, single-user, and multiuser technology. We also provide a synopsis of the role of limited feedback in the standardization of next generation wireless systems.read more
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Patent
Wireless device calibration for implicit transmit
Sudhir Srinivasa,Xiayu Zheng,Hongyuan Zhang,Rohit U. Nabar,Riddhi Madani,Atul Salhotra,Erik Heinke,Brian Bosso +7 more
TL;DR: In this paper, a first sounding packet is transmitted from the wireless communication device to a calibration station, and a second sounding packet from the calibration station to the wireless communications device is sent from the controller to the receiver.
Journal ArticleDOI
Low Complexity Transmit Antenna Selection with Power Balancing in OFDM Systems
TL;DR: This paper proposes an implementation-friendly antenna selection method which offers a reduced complexity in comparison with the optimal antenna selection scheme, which uses numerical optimization, and provides an analytic lower bound on the spectral efficiency.
Journal ArticleDOI
Limited feedback unitary precoding for MIMO full stream transmission
TL;DR: A novel singular value decomposition (SVD)-based precoder selection criterion optimizing the bit error rate (BER) performance is proposed and it can be calculated based on fast matrix computation algorithms.
Proceedings ArticleDOI
Flag orbit codes and their expansion to Stiefel codes
TL;DR: This work discusses group orbits codes in homogeneous spaces for the unitary group, known as flag manifolds, and some explicit constructions from projective unitary representations of finite groups in 2 and 4 dimensions are described.
Journal ArticleDOI
Multicarrier Beamforming With Limited Feedback: A Rate Distortion Approach
TL;DR: Numerical results show that to achieve a target forward rate, the required feedback rate can be substantially reduced by joint quantization of the beamformers across subcarriers.
References
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A simple transmit diversity technique for wireless communications
TL;DR: This paper presents a simple two-branch transmit diversity scheme that provides the same diversity order as maximal-ratio receiver combining (MRRC) with one transmit antenna, and two receive antennas.
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Capacity of Multi‐antenna Gaussian Channels
TL;DR: In this paper, the authors investigate the use of multiple transmitting and/or receiving antennas for single user communications over the additive Gaussian channel with and without fading, and derive formulas for the capacities and error exponents of such channels, and describe computational procedures to evaluate such formulas.
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Space-time block codes from orthogonal designs
TL;DR: A generalization of orthogonal designs is shown to provide space-time block codes for both real and complex constellations for any number of transmit antennas and it is shown that many of the codes presented here are optimal in this sense.